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annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/FLYSArtifact.java @ 122:d3b8b0b1d010

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Implemented the step-forward part of the advance operation. flys-artifacts/trunk@1446 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Thu, 10 Mar 2011 05:56:17 +0000
parents e0ded17a4846
children ebb1cb69d847
rev   line source
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1 package de.intevation.flys.artifacts;
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2
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3 import java.util.HashMap;
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4 import java.util.List;
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5 import java.util.Map;
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6 import java.util.Set;
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7 import java.util.Vector;
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8
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9 import javax.xml.xpath.XPathConstants;
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10
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11 import org.apache.log4j.Logger;
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12
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13 import org.w3c.dom.Document;
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14 import org.w3c.dom.Element;
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15 import org.w3c.dom.Node;
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16 import org.w3c.dom.NodeList;
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17
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18 import de.intevation.artifacts.ArtifactFactory;
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19 import de.intevation.artifacts.CallContext;
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20
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21 import de.intevation.artifacts.common.ArtifactNamespaceContext;
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22 import de.intevation.artifacts.common.utils.XMLUtils;
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23
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24 import de.intevation.artifactdatabase.DefaultArtifact;
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25 import de.intevation.artifactdatabase.data.DefaultStateData;
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26 import de.intevation.artifactdatabase.data.StateData;
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27 import de.intevation.artifactdatabase.state.State;
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28 import de.intevation.artifactdatabase.state.StateEngine;
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29 import de.intevation.artifactdatabase.transition.TransitionEngine;
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31 import de.intevation.flys.artifacts.context.FLYSContext;
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32
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33
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34 /**
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35 * The defaul FLYS artifact.
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36 *
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37 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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38 */
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39 public abstract class FLYSArtifact extends DefaultArtifact {
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40
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41 /** The logger that is used in this artifact.*/
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42 private static Logger logger = Logger.getLogger(FLYSArtifact.class);
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45 /** The XPath that points to the input data elements of the FEED document.*/
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46 public static final String XPATH_FEED_INPUT =
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47 "/art:action/art:data/art:input";
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49 /** The XPath that points to the name of the target state of ADVANCE.*/
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50 public static final String XPATH_ADVANCE_TARGET =
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51 "/art:action/art:target/@art:name";
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52
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53 /** The constant string that shows that an operation was successful.*/
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54 public static final String OPERATION_SUCCESSFUL = "SUCCESS";
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55
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56 /** The constant string that shows that an operation failed.*/
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57 public static final String OPERATION_FAILED = "FAILURE";
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60 /** The identifier of the current state. */
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61 protected String currentStateId;
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62
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63 /** The identifiers of previous states on a stack.*/
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64 protected Vector<String> previousStateIds;
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66 /** The name of the artifact.*/
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67 protected String name;
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68
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69 /** The data that have been inserted into this artifact.*/
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70 protected Map<String, StateData> data;
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73 /**
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74 * The default constructor that creates an empty FLYSArtifact.
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75 */
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76 public FLYSArtifact() {
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77 data = new HashMap<String, StateData>();
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78 previousStateIds = new Vector<String>();
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79 }
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81
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82 /**
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83 * Returns the name of the concrete artifact.
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84 *
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85 * @return the name of the concrete artifact.
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86 */
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87 public abstract String getName();
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88
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89
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90 /**
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91 * Returns the FLYSContext from context object.
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92 *
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93 * @param context The CallContext or the FLYSContext.
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94 *
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95 * @return the FLYSContext.
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96 */
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97 protected FLYSContext getFlysContext(Object context) {
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98 return context instanceof FLYSContext
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99 ? (FLYSContext) context
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100 : (FLYSContext) ((CallContext) context).globalContext();
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101 }
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102
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103
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104 /**
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105 * Initialize the artifact and insert new data if <code>data</code> contains
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106 * information necessary for this artifact.
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107 *
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108 * @param identifier The UUID.
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109 * @param factory The factory that is used to create this artifact.
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110 * @param context The CallContext.
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111 * @param data Some optional data.
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112 */
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113 @Override
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114 public void setup(
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115 String identifier,
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116 ArtifactFactory factory,
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117 Object context,
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118 Document data)
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119 {
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120 logger.debug("Setup this artifact with the uuid: " + identifier);
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121
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122 super.setup(identifier, factory, context, data);
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124 FLYSContext flysContext = (FLYSContext) context;
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125 StateEngine engine = (StateEngine) flysContext.get(
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126 FLYSContext.STATE_ENGINE_KEY);
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127
121
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128 String name = getName();
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129
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130 logger.debug("Set initial state for artifact '" + name + "'");
119
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131 List<State> states = engine.getStates(name);
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132
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133 setCurrentState(states.get(0));
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134 }
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135
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136
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137 /**
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138 * Insert new data included in <code>input</code> into the current state.
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139 *
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140 * @param target XML document that contains new data.
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141 * @param context The CallContext.
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142 *
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143 * @return a document that contains a SUCCESS or FAILURE message.
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144 */
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145 @Override
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146 public Document feed(Document target, CallContext context) {
121
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147 Document doc = XMLUtils.newDocument();
119
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148
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149 XMLUtils.ElementCreator creator = new XMLUtils.ElementCreator(
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150 doc,
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151 ArtifactNamespaceContext.NAMESPACE_URI,
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152 ArtifactNamespaceContext.NAMESPACE_PREFIX);
119
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153
121
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154 Element result = creator.create("result");
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155 doc.appendChild(result);
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156
121
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157 try {
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158 saveData(target, XPATH_FEED_INPUT);
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159 creator.addAttr(result, "type", OPERATION_SUCCESSFUL, true);
121
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160 }
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161 catch (IllegalArgumentException iae) {
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162 creator.addAttr(result, "type", OPERATION_FAILED, true);
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163
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164 // TODO I18N this message - getMessage() returns a lookup string, no
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165 // human readable error message
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166 result.setTextContent(iae.getMessage());
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167 }
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168
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169 return doc;
119
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170 }
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171
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172
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173 /**
122
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174 * This method handles request for changing the current state of an
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175 * artifact. It is possible to step forward or backward.
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176 *
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177 * @param target The incoming ADVANCE document.
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178 * @param context The CallContext.
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179 *
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180 * @return a document that contains a SUCCESS or FAILURE message.
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181 */
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182 public Document advance(Document target, CallContext context) {
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183 Document doc = XMLUtils.newDocument();
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184
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185 XMLUtils.ElementCreator ec = new XMLUtils.ElementCreator(
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186 doc,
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187 ArtifactNamespaceContext.NAMESPACE_URI,
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188 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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189
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190 Element result = ec.create("result");
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191 doc.appendChild(result);
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192
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193 String targetState = XMLUtils.xpathString(
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194 target, XPATH_ADVANCE_TARGET, ArtifactNamespaceContext.INSTANCE);
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195
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196 if (isStateReachable(targetState, context)) {
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197 logger.debug("Advance: Step forward.");
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198
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199 Vector<String> prev = getPreviousStateIds();
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200 prev.add(getCurrentStateId());
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201
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202 setCurrentStateId(targetState);
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203
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204 ec.addAttr(result, "type", OPERATION_SUCCESSFUL, true);
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205
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206 return doc;
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207 }
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208
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209 // TODO IMPLEMENT STEP BACK!
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210
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211 logger.warn("Advance: Cannot advance to '" + targetState + "'");
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212
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213 ec.addAttr(result, "type", OPERATION_FAILED, true);
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214
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215 return doc;
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216 }
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217
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218
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219 /**
119
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220 * Returns the identifier of the current state.
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221 *
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222 * @return the identifier of the current state.
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223 */
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224 protected String getCurrentStateId() {
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225 return currentStateId;
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226 }
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227
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228
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229 /**
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230 * Sets the identifier of the current state.
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231 *
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232 * @param id the identifier of a state.
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233 */
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234 protected void setCurrentStateId(String id) {
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235 currentStateId = id;
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236 }
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237
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238
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239 /**
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240 * Set the current state of this artifact. <b>NOTE</b>We don't store the
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241 * State object itself - which is not necessary - but its identifier. So
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242 * this method will just call the setCurrentStateId() method with the
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243 * identifier of <i>state</i>.
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244 *
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245 * @param state The new current state.
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246 */
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247 protected void setCurrentState(State state) {
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248 setCurrentStateId(state.getID());
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249 }
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250
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251
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252 /**
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253 * Returns the current state of the artifact.
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254 *
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255 * @return the current State of the artifact.
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256 */
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257 protected State getCurrentState(Object context) {
121
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258 FLYSContext flysContext = getFlysContext(context);
119
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259 StateEngine engine = (StateEngine) flysContext.get(
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260 FLYSContext.STATE_ENGINE_KEY);
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261
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262 return engine.getState(getCurrentStateId());
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263 }
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264
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265
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266 /**
122
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267 * Returns the vector of previous state identifiers.
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268 *
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269 * @return the vector of previous state identifiers.
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270 */
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271 protected Vector<String> getPreviousStateIds() {
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272 return previousStateIds;
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273 }
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274
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275
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276 /**
121
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277 * Adds a new StateData item to the data pool of this artifact.
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278 *
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279 * @param name the name of the data object.
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280 * @param data the data object itself.
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281 */
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282 protected void addData(String name, StateData data) {
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283 this.data.put(name, data);
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284 }
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285
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286
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287 /**
122
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288 * This method returns a specific StateData object that is stored in the
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289 * data pool of this artifact.
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290 *
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291 * @param name The name of the data object.
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292 *
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293 * @return the StateData object if existing, otherwise null.
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294 */
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295 protected StateData getData(String name) {
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296 return data.get(name);
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297 }
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298
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299
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300 /**
121
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301 * This method stores the data that is contained in the FEED document.
119
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302 *
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303 * @param feed The FEED document.
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304 * @param xpath The XPath that points to the data nodes.
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305 */
121
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306 public void saveData(Document feed, String xpath)
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307 throws IllegalArgumentException
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308 {
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309 if (feed == null || xpath == null || xpath.length() == 0) {
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310 throw new IllegalArgumentException("feed.no.input.data");
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311 }
119
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312
121
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313 NodeList nodes = (NodeList) XMLUtils.xpath(
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314 feed,
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315 xpath,
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316 XPathConstants.NODESET,
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317 ArtifactNamespaceContext.INSTANCE);
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318
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319 if (nodes == null || nodes.getLength() == 0) {
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320 throw new IllegalArgumentException("feed.no.input.data");
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321 }
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322
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323 int count = nodes.getLength();
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324 logger.debug("Try to save " + count + " data items.");
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325
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326 for (int i = 0; i < count; i++) {
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327 Node node = nodes.item(i);
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328
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329 String name = XMLUtils.xpathString(
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330 node, "@art:name", ArtifactNamespaceContext.INSTANCE);
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331 String value = XMLUtils.xpathString(
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332 node, "@art:value", ArtifactNamespaceContext.INSTANCE);
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333
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334 if (name != null && value != null) {
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335 logger.debug("Save data item for '" + name + "' : " + value);
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336
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337 // TODO ADD INPUT VALIDATION!
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338 addData(name, new DefaultStateData(name, null, null, value));
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339 }
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340 }
119
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341 }
122
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342
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343
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344 /**
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345 * This method fills a state object with the data that have been inserted to
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346 * this artifact. This is necessary to use the isStateReachable() method,
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347 * because the Transitions need to know about the inserted data.
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348 *
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349 * @param state The state that needs to be filled with data.
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350 *
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351 * @return the filled state.
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352 */
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353 protected State fillState(State state) {
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354 Map<String, StateData> stateData = state.getData();
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355 Set<String> keys = stateData.keySet();
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356
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357 for (String key: keys) {
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358 StateData tmp = getData(key);
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359
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360 if (tmp != null) {
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361 StateData data = stateData.get(key);
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362 data.setValue(tmp.getValue());
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363 }
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364 }
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365
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366 return state;
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367 }
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368
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369
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370 /**
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371 * Determines if the state with the identifier <i>stateId</i> is reachable
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372 * from the current state. The determination itself takes place in the
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373 * TransitionEngine.
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374 *
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375 * @param stateId The identifier of a state.
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376 * @param context The context object.
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377 *
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378 * @return true, if the state specified by <i>stateId</i> is reacahble,
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379 * otherwise false.
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380 */
d3b8b0b1d010 Implemented the step-forward part of the advance operation.
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381 protected boolean isStateReachable(String stateId, Object context) {
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382 logger.debug("Determine if the state '" + stateId + "' is reachable.");
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383
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384 FLYSContext flysContext = getFlysContext(context);
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parents: 121
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385
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386 State currentState = fillState(getCurrentState(context));
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387 StateEngine sEngine = (StateEngine) flysContext.get(
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parents: 121
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388 FLYSContext.STATE_ENGINE_KEY);
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parents: 121
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389
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Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 121
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390 TransitionEngine tEngine = (TransitionEngine) flysContext.get(
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parents: 121
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391 FLYSContext.TRANSITION_ENGINE_KEY);
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parents: 121
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392
d3b8b0b1d010 Implemented the step-forward part of the advance operation.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 121
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393 return tEngine.isStateReachable(stateId, currentState, sEngine);
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parents: 121
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394 }
119
84c0b151203e Added a FLYSArtifact that serves as the default artifact for the FLYS application.
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parents:
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395 }
84c0b151203e Added a FLYSArtifact that serves as the default artifact for the FLYS application.
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396 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org